Limits are not related to ...

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Limits are not related to material resistance, as you mentioned, but to water hammer effects. Please note that 1 m/s  corresponds to about 10 bars of overpressure for steel pipes (1m/s*1000m/s/(9.8m/s^2)= 100 m=10 bar). So, 6m/s is 60 bars, which seems is a high value to me for water distribution and supply systems.